An identification procedure of nonlinear unit feedback system is investigated by means of operator notation and Fouriertransform, and some formulas for identification are given.
用算子符方法及傅里叶变换研究了单位反馈线性系统的一种辨识方法，并给出了辨识算式。
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The global Fouriertransform can also be obtained by switching (up to sign) the multiplication by a coordinate of the affine line and the differential operator with respect to this coordinate.